Asymmetric Diels–Alder reactions of N-allenoyloxazolidinones catalyzed by Cu(II)–bis(oxazoline) complexes
作者:Torsak Luanphaisarnnont
DOI:10.1016/j.tetlet.2014.10.051
日期:2014.12
Catalytic asymmetric Diels–Alder reactions of N-allenoyloxazolidinones were investigated. Various chiral metal–bis(oxazoline) and metal–pyridinebis(oxazoline) complexes were screened. Cu(SbF6)2(H2O)2(t-BuBox) was found to be the most effective catalyst, giving the product in high yield, enantioselectivity, and endo:exo selectivity. The relative reactivity between N-allenoyloxazolidinones and N-alkenoyloxazolidinones
研究了N-烯丙酰恶唑烷酮的不对称Diels-Alder催化反应。筛选了各种手性金属-双(恶唑啉)和金属-吡啶双(恶唑啉)配合物。发现Cu(SbF 6)2(H 2 O)2(t -BuBox)是最有效的催化剂,从而以高收率,对映选择性和内-外选择性产生产物。还研究了N-烯丙基羰基恶唑烷酮和N-烯基羰基恶唑烷酮之间的相对反应性。提出了一个立体诱导模型以解释对映选择性和内源性:exo。 选择性。